The best transmission option is when high transmission reduction is required. A worm gear is equivalent to a helical equipment with a throat cut to improve the outer diameter of the wheel. The throat enables the worm gear to wrap totally all around the threads of the worm. By reducing the threads on the worm fairly than the tooth, and by changing the amount of threads, different ratios can be achieved without having changing the mounting arrangement. A unique attribute of worm gears and worm equipment assemblies is their potential to prevent reverse rotation.